18868418 has 16 divisors (see below), whose sum is σ = 29716416. Its totient is φ = 8968080.

The previous prime is 18868411. The next prime is 18868433. The reversal of 18868418 is 81486881.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18868411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6773 + ... + 9143.

It is an arithmetic number, because the mean of its divisors is an integer number (1857276).

Almost surely, 2^18868418 is an apocalyptic number.

18868418 is a deficient number, since it is larger than the sum of its proper divisors (10847998).

18868418 is a wasteful number, since it uses less digits than its factorization.

18868418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2569.

The product of its digits is 98304, while the sum is 44.

The square root of 18868418 is about 4343.7792301175. The cubic root of 18868418 is about 266.2227485756. Note that the first 3 decimals are identical.

The spelling of 18868418 in words is "eighteen million, eight hundred sixty-eight thousand, four hundred eighteen".